• Some elements lose one or more electrons in forming ions.
  • These ions are known as “cations” because they are positively charged and migrate toward the negative electrode (cathode) in an electrical field.
  • The term comes from a Greek word meaning “move” and was first coined by Michael Faraday.
  • Cations play important roles in our daily lives.
  • Sodium, potassium, and magnesium ions are essential for blood pressure regulation and muscle contraction.
  • Calcium ion is an important part of bone structure.
  • Sodium ions can used in water softeners to remove other harmful elements.
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